Dandy roll and cylinder mold and method of making same



May 10, 1938. P. s. SINCLAIR DANDY ROLLS AND CYLINDER MOLDS AND METHOD OF MAKING SAME Filed Jan. 22, 1936 3 Sheets-Sheet l May 10,1938. P. s. SINCLAIR DANDY ROLLS AND CYLINDER MOLDS AND METHOD OF MAKING SAME Filed Jan. 22, 1936 3 Sheets-Sheet 2 am 0 m E V m ATTORNEY.

P. S. SINCLAIR DANDY ROLLS AND CYLINDER MOLDS AND METHOD OF MAKING SAME May 10, 1938.

Filed Jan. 22, 1956 5 Sheets-Sheet 5 INVENTOR, fl'feri JiflZZ/Z' ATTORNEY.

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Patented May 10, 1938 UNITED STATES @ATENT QFFEQE DANDY RULE.- AND CYLINDER MOLD AND METHOD OF MAKING SAlIE 7 Claims.

This invention relates to dandy rolls and cylinder molds used in the manufacture of paper and more particularly to the manner in which the woven wire fabric which covers such rolls is joined together at the edges.

I-Ieretofore dandy rolls have usually had a sewed seam. This sewing is done by passing a wire back and forth from one side of the seam to the other interlacing with one or two or more of the wires on each side which extend parallel to the seam. Such seams have several objectionable features. One objection is that the wire used for the sewing fills up the meshes or interstices of the woven wire fabric to a considerable extent and because of the decreased drainage resulting therefrom when the dandy roll or cylinder mold is placed in operation there is left in the paper a mark, a defect more or less serious depending on the quality of the paper, which is known as seam-marking. Also such sewed seams are never as strong as the wire fabric itself and sometimes pull out soon after the dandy roll has been placed in operation. While the quality of the workmanship no doubt has a great deal to do with the frequency with which this occurs nevertheless it may be safely stated that all manufacturers of such apparatus have experienced it to some extent.

It has been suggested and some attempts have been made heretofore to join the edges together by means of solder and thus to produce a soldered seam instead of a sewed seam. There are a. number of difficulties encountered in such a construction and while it is not necessary to enumerate them all there is one which will be described somewhat in detail as it is this particular difliculty which is an object of the present invention to eliminate or at least to make such improvements in connection therewith as to render it of little practical importance. This difficulty has to do with the tendency of the solder to spread away from the place where it is desired to have it. This has a double consequence. In the first place the union of the parts is not complete and does not constitute a satisfactory soldered joint. If the solder spreads away too much there may be places where there is no union of the wires at all. The second consequence is that the solder may run into and fill up the meshes oi the wire fabric either partly or completely and thus accentuate the seam marking. There has heretofore been a tendency to use an excess of solder, so that even after a certain amount has spread away there will nevertheless be sufficient left to produce a satisfactory joint, and this very excess has increased the tendency to clog the meshes and cause seam marking.

There is a somewhat similar seam or joint employed in the manufacture of Fourdrinier wires for paper-making machines. These also have 5 usually been sewed seams although recently there have been more or less successful attempts to produce a soldered joint or seam. While there v are similarities in Fourdrinier and dandy-roll seams there are nevertheless very important differences between the requirements for the two types of seams and it is important to bear this in mind because it does not by any means necessarily follow that the production of a certain type of improved seam for use in connection with Fourdrinier wires can also be used satisfactorily in dandy rolls and cylinder molds. In the first place it is desirable to have the wire on. a dandy roll as taut and tight as possible. This is not true of Fourdrinier wire which is in the form of an end- 20 less belt. It is a cardinal principle in the operation of moving belts that the tension be kept as low as possible. Any such tension as is used on a dandy roll applied to a Fourdrinier belt would result in all kinds of trouble such as overloading 25 the bearings, springing the shaft around which the belt passes, and also increasing breakage due to the continuous cycles of flexure under severe tension. As a matter of fact Fourdrinier belts never do operate under anywhere near the same tension as the covering of a dandy roll. Furthermore the feature of operation of continually being flexed as it passes around the rolls upon which it is supported imposes on a Fourdrinier wire a requirement for a certain amount of flexibility which is not needed in a dandy roll.

In one sense a moderate amount of clogging of the meshes and seam marking would not be so important in a Fourdrinier seam as in a dandyroll seam. Both produce an undesirable mark it is true but the Fourdrinier mark does not appear so frequently in the paper web. This is because the Fourdrinier belt is 40 to feet long while the dandy roll is only '7 to 24 inches in diameter. Because of this frequency of reoccurrence a degree of seam marking which would be merely objectionable in a Fourdrinier belt may be intolerable in a dandy roll. It is also to be noted that the seam in a Fourdrinier wire'can be, and generally is, made when the wire is not under tension and therefore relatively easy to handle while the seam in a dandy roll must be made while the wire is under a tension which is very considerable. Other differences will be mentioned herein after but for the present it should be emphasized that a seam in a dandy roll presents serious difficulties not encountered at all in the making of seams in Fourdrinier wires which at first would seem to be a very analogous type of construction and use.

While both dandy roll and cylinder mold are referred to herein it is the former that is used the more frequently but it is to be understood that so far as the present invention is concerned a cylinder mold may be considered to be the full equivalent of a dandy roll and in both specification and claims dandy roll is to be considered generic to both cylinder molds and dandy rolls without the necessity of employing some indefinite or little used term for the purpose of including both structures.

It is an object of the present invention, broadly stated, to produce a seam or joint in a dandy roll or cylinder mold which does not require any sewing.

Another object of the invention is to produce a dandy-roll seam that will be as strong or even stronger than the wire cloth in which it is made.

A still further object of the invention is to produce a dandy-roll seam that will have no tendency to stretch and thus loosen the wire on the roll.

And it is also an object of the invention to produce a seam for dandy rolls that will offer practically the same area for drainage through the interstices as is offered at other parts of the wire fabric where there is no seam.

More specifically it is one of the objects of the invention to provide a soldered seam or joint of the character escribed which shall have means employed in the construction thereof to cause most of the solder to take its position near the ends of the abutting wires and in which a very much smaller quantity is allowed to take its position away from the ends of the wires to be fastened together.

Still more specifically stated, it is an object of the invention, in one form thereof, to provide means for obstructing the flow of solder away from the ends of the wires which it is desired to solder together.

In another form of the invention, it is a specific object thereof to provide fins of solder to be positioned between the ends of the wires to be soldered together to provide a nucleus to hold most of the solder near the middle of the joint and prevent it from being drawn away therefrom so that most of the solder ultimately rests where it is effective for the purpose intended.

These and other objects of the invention will readily appear to those skilled in the art to which it appertains by a consideration of the following description of several different embodiments thereof taken in connection with the accompanying drawings in which Fig. 1 is a longitudinal section, greatly enlarged, of the wire fabric of a dandy roll, taken at the joint and transversely thereof, and ready for the brazing or soldering operation;

Fig. 2 is a section similar to Fig. 1, but after the brazing or soldering operation, taken on the line 22 of Fig. 5, and shows the nature of the joint where two upper warp wires are in abutting relationship;

Fig. 3 is a similar cross section taken on the line 3--3 of Fig. 5 and shows the appearance of the joint midway between the warp wires;

Fig. 4 is a section taken on the line 4-6 of Fig. 5 and shows the appearance of the completed joint where two lower warp wires are in abutting relationship with each other;

Fig. 5 is a top plan view of a portion of the wire fabric near the seam or joint between two adjacent edges thereof Fig. 6 is a section, similar to Fig. 1, of a modified form of the invention and shows the parts in their relative positions just prior to the application of heat to melt the solder;

Fig. 7 is a section, similar to Fig. 6, taken on the line ll of Fig. 10 and shows the appearance of the completed joint where two of the upper warp wires are disposed in abutting relationship;

Fig. 8 is a section, similar to Fig. '7, taken on the line Ti-'e' of Fig. 10 and shows the appearance of the completed joint midway of the warp wires;

Fig. 9 is a section, similar to Fig. '7, taken on the line ll of Fig. 10 and shows the appearance of the joint where two of the lower warp wires are in abutting relationship;

Fig. 10 is a top plan view of a portion of the wire fabric, shown in Figs. 6 to 9, taken near the seam or joint between two adjacent edges thereof;

Fig. 11 is a section, similar to Fig. 1, of another modified form of the invention showing the parts just before the opposing edges of the wires have been brought close together for the application of the heat for soldering;

Fig. 12 is a section of still anoth r modified form of the invention, similar to but slightly different from the form of the invention shown in Fig. 11;

Fig. 13 is a section, taken on the line |3l3 of Fig. 16, of a completed joint and shows the appearance thereof where two upper warp wires are disposed in abutting relationship, the appearance of the joint in this figure and also in the remaining figures applying equally to both of the forms of the invention shown in Figs. 11 and 12;

Fig. 14 is a section, taken on the line I l-ll. of Fig. 16, and shows the appearance of the joint as it appears midway of the warp wires;

Fig. 15 is a section, taken on the line I5I5 of Fig. 16, and shows the appearance of the joint as it appears where two of the lower warp wires are disposed in abutting relationship; and

Fig. 16 is a top plan View of a portion of a woven wire fabric taken near the joint therein made in accordance with the showing of either Fig. 11, or Fig. 12 and the following Figures 13 to 15 inclusive.

Referring to the drawings more in detail and particularly to the form of the invention shown in Figs. 1 to 5, the reference characters El, 22, 23, 24 and 25 indicate a part of the warp wires positioned to the left of the joint as seen in Fig. 1 and above the joint as seen in Fig. 5. The corresponding warp wires to the right of the joint as seen in Fig. 1 and below the joint as seen in Fig. 5 are indicated by the reference characters 26, 2?, 28, 29 and 38. The weft wire nearest to the edge where the joint is to be made on the left side thereof (Fig. 1), is shown at 3| and the corresponding weft wire on the other side of the seam or joint is shown at 32. In preparing the edge of the wire fabric for the making of the seam or joint one or more weft wires are removed, the last one to be removed in the edge to the left of the seam in Fig. 1 being the one just to the right of the wire 3! The ends of the warp wires 2|, 22, 23, etc. are then cut off the proper distance. This is approximately at, or preferably slightly beyond, the vertical plane, as seen in Fig. 1, that would pass through the center of the position of the last weft wire to be removed or in other words the distance between the center of the weft wire 3! to the end of the warp wires El, 22, 23, etc. is about equal to or slightly greater than the distance between weft wires in the fabric.

While throughout both specification and claims the warp wires are described as extending circumferentially and the weft wires in the other direction it is possible in the actual construction to interchange this relationship so that the weft wires extend circumferentially and the warp wires parallel to the axis. Both dandy rolls and cylinder molds have been actually constructed in this manner although as at present advised it does not seem to be so satisfactory, all things considered, as the other way. However, even though for the sake of definiteness and clearness, only one form of construction has been set forth in the specification, drawings and claims, it is to be understood that it is intended that the invention be considered broad enough to include any such mere reversal of parts.

In the space left vacant by the removal of the weft wire just to the right of the weft wire 3! in Fig. 1 there is placed a barrier member 33 which is shown in the drawings as of triangular cross sectional form. This barrier member 33 is. preferably formed from material that is the same as or similar to the material that is used for the wires of the wire fabric. Positioned to the right of the barrier member 33, that is, on the side away from the weft member 3| and projecting slightly be yond the ends of the warp wires is a member 34 of fusible material such as hard silver solder of a low melting point. This member is shown in Fig. 1 as of circular cross section. It will be noted that the ends of the warp wires 29 and 22 turn inwardly slightly so as to clinch around the fusible member 3d and hold it in place. This may be accomplished by cutting off the warp wires slightly longer than would correspond with the center of the removed weft wire so that the warp wires would have this slight inward direction due to their formation in the fabric. The natural resiliency of the wires permits the barrier member 33 and the fusible member M to be pushed into place and then the ends of the warp wires snap back inwardly a slight distance to hold the members 33 and 34. On the other hand the warp wires may be out off so that they are straight without any inward turn and after the members 33 and 34 are put in position they may be turned inward by means of a crimping tool. Or both of the foregoing methods may be used in combination. It is to be understood that the members 33 and 34 are not held in place with any great force but even a slight force is sufficient to be of substantial assistance in preventing them from slipping out of place before the subsequent operations are performed. A similar barrier member 35 and member of fusible material 36 is inserted in the space between the projecting ends of the warp wires 26, 21, etc, as shown at the right of the joint.

After the barrier and fusible members are in position on both sides of the seam the opposed edges of the wire fabric are drawn together by means of clamps until the parts are in the relative positions shown in Fig. 1. Heat is then applied in any suitable form such as by means of a gas-acetylene flame. It is not only desirable but highly important that the temperature of t flame shall not be higher than necessary in ordo.- to avoid the danger of overheating the fine warp wires and injuring them. It is for this reason that the solder was specified as being a hard silver solder of low melting point. It is essential that it be a hard solder to provide the necessary strength and it is also desirable that it have a low melting point in order to flow under the action of heat readily without injury to the ends of the warp wires.

The general appearance of the completed seam or joint is shown in Fig. 2, the section being taken as already stated in the longitudinal plane of two warp wires which are in abutting relationship at the seam and at the upper part thereof. The abutting warp wires are indicated by the reference characters 2! and 26 and the next adjacent pair of warp wires positioned just behind the wires 2! and 26 are indicated in dotted lines at 22 and 21. It will be noticed that the combined action of the softening of the solder and the drawing together of the ends of the warp wires serves to squeeze the solder upwardly between the ends of wires 2! and 26 providing a thin layer of solder 31 therebe'tween. The tendency of the solder to get into the space between the ends of the wires 2! and 25 is also largely due not only to the squeezing effect but also to that phenomenon of liquids which gives rise to capillary attraction and surface tension. This also causes the drawing up of the solder beneath the warp wires as indicated at 38 and provides a reinforcing and strengthening mass of solder. It is to be understood that while the section taken in Fig. 2 is only able to show the solder as gathered at the under side of the wires 2| and 26 it does as a matter of fact also extend up around the sides. The tendency for the solder to be drawn by the same liquid tension along the warp wires toward the weft wires and away from the joint is prevented almost entirely by the barriers 33 and 35.

In Fig. 3, which is a section taken midway between two warp wires, the fusible material or solder is shown at 39 as greatly reduced in cross section due to the drawing of the solder toward the warp wires and also shows how the same tension which draws the solder toward the warp wires also serves to spring the light barrier members toward each other slightly.

Fig. 4 is similar to Fig. 2 but differs in that the section is taken where two of the lower ends 22 and 2'! of the warp wires are in abutting relationship instead of two upper ones as shown in Fig. 2. The layer of solder between the ends of the warp wires is shown at 37c and the supporting and reinforcing mass of solder above the wires is indicated at 38a.

The different figures of the drawings show the warp wires as being in exact alinement on opposite sides of the seam. This is true throughout a part of the length of the seam but not everywhere. The diameter of a dandy roll is not exactly the same from one end to the other. Sometimes this is so because the center is purposely made larger or the roll is said to be crowned. In other cases the difference in diameter is simply due to irregularities. In any event it becomes necessary to remove more weft wires in some parts of the seam than in others. The result is that the manner in which the warp wires aline themselves is constantly shifting along the In one place the warp wires may be in alinement as shown in the diiferent figures of the drawings. A little further along the warp wires are no longer in alinement but are staggered with respect to each other. Still further along they appear in alinement in looking down upon them but an upper warp wire is opposite a lower warp wire. The form of soldered conspace.

nections under all these varying conditions has not been shown as those skilled in the art will be able to amplify the foregoing illustrations to apply to such shifting relationships. It should be stated, however, that this is one more difference which distinguishes the problem of providing a seam in a dandy roll from that of providing a seam in a Fourdrinier wire. In the latter case there is a certain amount of slack in use, as with all belts, and more-over the joint is usually made before the wire is in place and therefore not under tension. In such endless belts it is considered desirable to stagger the opposed warp wires uniformly clear across the seam as flexibility is deemed more important than strength which is the chief desideratum in dandy rolls.

In the modification of the invention shown in Figs. 6 to 9 barrier members and 351) are provided which have a-circular cross section. The member 83b is placed within the space between the ends of the warp wires 25, 23, etc., and the member 351? is placed within the space between the ends of the warp wires 2%, 2?, 28, etc. A member 3 52) of fusible material is then placed against the member 33b and a similar member 3% is placed against the member 351), both of the members 2% and 36?) being positioned principally within the space between the warp wires and protruding slightly beyond such As described with respect to the form of the invention shown in Figs. 1. to 5 the warpwires are converging slightly near the ends and serve to clinch around the members 3417 and 35b of fusible material and hold them in place. As already described this may be due to the manner of cutting the warp wires or to the use of a crimping tool or to both methods.

The cross-sectional form of the members 341) and 36b is important in obtaining the best results and while the form shown in the drawings is considered to be the preferable form it is to be understood that there may be deviations therefrom because of difiicuity and expense in making it precisely as shown or because of stock material somewhat different but more available or for any other reason and such deviations will merely mar the complete attainment of the purpose of the invention although such purpose may be attained more or less approximately depending upon how great such deviations are. The form of the members 33b and 35b shown in the drawings and considered the best for the purpose of the invention is devised to occupy the space between the ends of the warp wires as fully as possible. The upper and lower sides of the members of fusible material are not parallel but converging so as to correspond with the converging direction of the warp wires. This not only serves to fill up the space more completely but provides a better cross-sectional form for holding the members in place when the crimping tool is used. The side of the member of fusible material which is nearest to the barrier member is preferably curved so as to present a concave surface toward the barrier member and thus increase the amount of solder in such member more than would be the case if it were a plane surface.

As described with respect to the form of the invention shown in Figs. 1 to 5, clamps are applied which tend to draw the ends of the warp wires together and heat is applied. As the solder softens the material in liquid or semi-liquid form is drawn toward the ends of the warp wires and into the space between the ends of the warp wires providing a layer of solder 311) between these ends and holding them together. A supporting mass of solder 38b also gathers under the warp wires and increases the strength of the joint. It is to be noted that the barrier members 331) and 35b prevent any substantial amount of solder from following the warp wires back away from the joint. In Figs. 8 and 10 is shown how the solder midway between the warp wires is drawn away to a very much reduced cross section 391).

Fig. 9 shows the manner in which the solder is distributed where two lower warp wires are in abutting relationship. A thin layer of solder 370 is drawn into the space between the abutting ends of the warp wires 22 and 21 and a reinforcing mass of solder 38c gathers on the upper surfaces of the wires.

Figs. 11 to 15 show another modification of the invention, in fact two other modifications, although they are very similar to each other. In Fig. 11 a member 38 of fusible material such as solder is shown as having two substantially cylindrical portions, 4| extending to the left, and 42 extending to the right. The member 4|) also has an upwardly extending fin 43 or thin layer of solder and a similar downwardly extending fin M. The warp wires on the left of the seam or joint 2|, 22, 23, etc., are all cut off slightly longer than would correspond with the center of the position of the last weft wire to be removed so that the ends of the wires are positioned in a slightly converging direction. In a similar manner the warp wires to the right of the joint, 26, 21, 28, etc., are cut off slightly longer than would correspond with the center of the position of the last weft wire to be removed so that they are slightly converging in direction. The fusible member is pushed into position so that the right hand portion 42 is resiliently held by the warp wires 26, 21, 28, etc., as shown in Fig. 11. The usual clamps are applied to draw the edges of the fabric together until the left hand portion 4| of the fusible member Ml is also embraced by the warp wires 2|, 22, 23, etc. It is to be understood that Fig. 11 represents the parts just prior to this last named operation of drawing the edges together which is necessary before heat is applied.

Fig. 12 shows two members 46a and 40b of fusible material, the first being positioned to the left of the seam or joint and the other to the right. The member Mia is provided with a cylindrical portion lla positioned between the warp wires 2|, 22, 23, etc., and resiliently held in place by them. The member 46b is similarly provided with a cylindrical portion 42a which is positioned between the warp wires 26, 21, 28, etc., and resiliently held in place by them. The member 40a is also provided with an upwardly extending fin 43a and a downwardly extending fin Ma. Similarly the member 402) is provided with an upwardly extending fin 43b and a downwardly ex tending fin 441). Just prior to the application of heat clamps are used for drawing the opposed edges of the wire fabric toward each other until the flat surfaces are in contact. At this stage of the process the embodiment shown in Fig. 11 and the embodiment shown in Fig. 12 are substantially the same the only difference being that in Fig. 11 the upper fin is one integral piece and in Fig. 12 it is two separate pieces until after the heat has been applied.

After the heat has been applied the end of the Warp wire 2| and the end of the warp wire 28 are joined together by means of the solder 31d positioned therebetween as shown in Fig. 13. This solder 31d acts as a nucleus toward which the solder is drawn in the form of a reinforcing mass 38d. The result is more or less the same as in the forms of the invention shown in Figs. 1 to 10 but the method of accomplishing the result is somewhat different in that in Figs. 1 to 10 the solder is prevented or obstructed from flowing along the warp wires and forced between the ends of the warp wires whereas in Figs. 11 to 15 a certain amount of solder is positioned initially between the ends of the warp wires and draws the rest of the solder away from creeping along the warp Wires in a direction away from the joint.

In Fig. 14 is shown the appearance of the solder midway between adjacent warp wires. It will be noted that, as in the previous forms of the invention, the tendency to draw the solder into the space between the ends of the warp wires has decreased the amount of the solder in this midway position and the cross section is somewhat less. Fig. 15 shows the appearance of the joint between the two lower warp wires 22 and 27. The portion 31c of the solder which was originally the lower fin or fins unites the ends of the warp wires and the rest of the solder gathers around the upper and lateral sides of the warp wires in a reinforcing mass 38c.

It is to be understood that the foregoing embodiments of the invention have been selected for purposes of illustration only and various changes may be made therein without departing from the spirit and scope of the invention as defined in the subjoined claims.

I claim:

1. A seam for the woven wire covering of a dandy roll comprising a woven wire fabric having two edges on opposite sides of the seam, said edges extending parallel to the weft wires and transversely of the warp wires, the weft wire nearest to each edge being positioned slightly back therefrom so that the ends of the warp wires project beyond said weft wires, a member of fusible material positioned between the projecting warp wires of each edge, and means for controlling the flow of solder upon the application of heat so that the amount of solder flowing between the abutting ends of the warp wires is increased and the amount of solder drawn along the warp wires away from the edge is decreased.

2. A seam for the woven wire covering of a dandy roll comprising a woven wire fabric having warp wires and weft wires positioned around the dandy roll with the warp wires extending circumferentially of the dandy roll and both the weft wires and the seam extending parallel to the axis of the roll, the warp wires at each side of the seam having a space therebetween formed by the removal of a weft wire, a barrier member of non-fusible material positioned in each of said spaces back against the crossed warp wires and away from the seam, a member of fusible material in each space between said barrier members and the ends of the warp wires, said fusible material extending beyond the ends of the warp wires and into the space between the abutting ends of the warp wires.

3. A seam for the woven wire covering of a dandy roll comprising a woven wire fabric having warp wires and weft wires positioned around the dandy roll with the warp wires extending circumferentially of the dandy roll and both the weft wires and the seam extending parallel to the axis of the roll, the warp wires at each side of the seam having a space therebetween formed by the removal of a weft. wire, a member of fusible material positioned in said space at each side of the seam, and fins of fusible material integral with and extending from said members laterally both ways into the space between the opposed abutting ends of the warp wires.

4. A seam for the woven wire covering of a dandy roll comprising a woven wire fabric having warp wires and weft wires positioned around the dandy roll with the warp wires extending circumferentially of the dandy roll and both the weft wires' and the seam extending parallel to the axis of the roll, the Warp wires at each side of the seam having a space therebetween formed by the removal of a weft wire, a barrier member of triangular cross-sectional form and of nonfusible material positioned in each of said spaces with the apex thereof positioned against the crossed warp wires and away from the seam, a member of fusible material in each space between said barrier member and the ends of the warp wires, said fusible material extending beyond the ends of the warp wires and into the space between the abutting ends of the warp wires.

5. The process of making a seam in the woven wire covering of a dandy roll comprising positioning a woven wire fabric around the supporting structure of a dandy roll with the warp wires extending circumferentially and the weft wires extending parallel to the proposed seam and to the axis of the dandy roll, removing on each side of the seam one of the weft wires, cutting the projecting warp wires on each side of the seam so that they extend to approximately the center of the position of the removed weft wire, positioning a barrier in each space left by a removed weft wire and against the crossed warp wires, positioning a member of fusible material in the rest of each space left by the removal of said weft wires, said members of fusible material projecting slightly beyond the ends of the warp wires, drawing the opposed edges of the seam together so that the two members of fusible material are pressed together with the ends of the warp wires spaced a slight distance apart, and applying heat to said members while still under the action of the force which draws them together whereby the fused material is forced into the space between the ends of the warp wires and barred from flowing along the warp wires away from the seam.

6. A seam for the woven wire covering of a dandy roll comprising a woven wire fabric having warp wires and weft wires positioned around the dandy roll with the warp wires extending circumferentially of the dandy roll and both the weft wires and the seam extending parallel to the axis of the roll, the warp wires at each side of the seam having a space therebetween formed by the removal of a weft wire, a member of fusible material having enlarged portions on opposite sides thereof, one of said enlarged portions being positioned in said space on one side of said seam and the other enlarged portion being positioned in said space on the other side of said seam, and a pair of fins integral with said fusible material extending in opposite directions into the space between the abutting ends of the warp wires.

7. The process of making a seam in the woven wire covering of a dandy roll comprising positioning a woven wire fabric around the supporting structure of a dandy roll with the warp wires extending circumferentially and the weft wires extending parallel to the proposed seam and to the axis of the dandy roll, removing on each side site ends of the warp wires, drawing the opposed edges of the wire fabric together and while they are still under the action of the force applying heat to the fusible material whereby the melted material is drawn toward and between the abutting ends of the Warp wires.

PETER S. SINCLAIR. 

